Vulcanized cumaron-rubber product and process of making same.



No Drawing.

nnrrnn STAT-Eat PATENT creme,

ALFRED A. warm, or cannwnnn, NEW Jansen,

ASSIGNOR T ELLIS-FOSTEEUOM- rAnY', A oonronarron ornE-w Jnnsnir. v

VULCANIZED C'UIVIARON-RUBBER PRODUCT AND PROCESS OF MAKING SAME.

To all whom it may concern:

Be itlknown that I, ALFRED A. Wnms, a citizen of the, United States, residing at Caldwell, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Vulcanized Cumaron-Rubber Products and Processes of Making Same, of which the following is a specification;

'lhis invention relates to preparation of mlxtures of rubber or rubber compositions such as those generally-known as compounded rubber and rela'tesparticularly to comphalt, pitch, candle tar, and stearic acid may beemployed', while'in these various such as iron oxid, silica, barytes, magnesium oxid and carbonate, calciu'm carbonate, zincjoxid, white le'ad, zinc sulfid, litharge,

positions containing cumaron resin which is a product derived by the polymerization of cumaron, indene, andithe like, contained in solvent naphtha or similar raw material.

umaron resin may beobtained in different grades of hardness, ranging from liquid substances and plastic bodies to hard, brittle materialof high meltingpoint and grades of resinous material adapt themselves well in the manufacture of soft and hard rubber as the resin is com= paratively inert in its action on'rubber,

thereby difiering from ordinary rosin, which as is well known, is quite a strong oxidizing agent.

In the manufacture of difl'erent "compos1- tions, various kinds of rubber may be employed, such a Para, Kongo, Pontianak, guayule, plantationrubber, and various natural and reclaimed rubbers, as also various rubber subst1tutes,

including white and brown substitutes, polymerized oils and the like. In some of the cheaper mixtures, as-' various oils, waxes hard rubbers and also certain other grades of rubber, carnauba wax, Chinese wax, Japanse' wax, candelilla wax, etc., may be employed. In. other reparations or compounds, vaseline and mineral oils may be incorporated. i

filling agents graphite, asbestos, magnesium lithopone,

fVarious mineral matters and antimonysulfid, both red and golden," and other 'agents 'ofla pigmentary character, such Specification of Letters Patent.

Application filed Apri125 1917. Serial No. 164,575.

-Para rubber m ma Nov. an rat a,

as cadmium sulfid,

ultra marine, sulfid of arsenic, and various chromium oxid, indigo,

lakes which are not materially aflected by sulfur, may be employed;

The proportion of cumaron resin may vary from a few per cent. up to alarge proportion of the material depending on the particular use to which the rubber composition is to be put.

Examples of compositions of this" character are the following: A cheap mixture suitable for packing rings and the like is the following:

in the usual manner and Worked into the proper intimate admixture and suitably vulcanized. a

Another composition of a higher grade is the following:

35 parts, Kongo rubber 6O uinaro'n resin 10-20 Brown substitute 25 China clay l5 Vermilion 1 part. Golden slilfid of antimony 20 parts. Magnesium oxid 1 part.

,In another case 5 parts of rubber composition were incorporated with 1 part of powdered cumaron resin by passing repeatedly through calender rolls. Approximately part of talc was used to keep the-composition from adhering to the roll.- When the mass was uniform in mixture it was vulcanized at 155 C.

In still another case 10 parts of rubber substitute, 5 parts'of cumaron-resin and 5 parts of rubber flux were warmed and thoroughly mixed, Lithar'ge, magnesium carbonate, barytes and talc were incorporated to bring the mass up to the proper consistency and then vulcamzed- A prodnot was obtained. which was suitable as a cheap gasket compound.

- While no prohibltion is made against the use of resinous bodies other than cumaron protect the rubber against oxidation so that it may be looked upon rather as a preservative than as a destructive agent, and the invention embraces the application of cou- .marone resin as a protective or stabilizing agent for rubber to render it less prone to oxidizing action,'especially in the case of reclaimed rubber which easily deteriorated.

The term extending materials or agentsas used herein refers to the various filling substances employed in rubber compoundsor compositions such as mineral powdersor orgamc substances. 'For example, rubber substitute made by treating vegetable oils with sulfur or sulfur chlorid may be em- Q I i 1,248,226

ployed as a filling agent. The brown substitute referred to above is of this character.

What I claim is 1. A vulcanized composition rubber product comprising natural and reclaimed rubber, cumaron resin and extending materials.

2. As a new article of manufacturia nonplastic' rubber .composition containing cumaron resin as a protective agent against oxidation.

3. A vulcanizable composition comprisin rubber, cumaron resin, sulfur and exten ing'agents.

4. A rubber composition comprising natural and reclaimed rubber, cumaron resin and a vulcanizmg agent.

5. As anew article of manufacture a vulcanized composition containing reclaimed rubber and cumaron resin as 'a protective agent agalnst oxidation.-

canized product comprising rubber and cumaron resin.

7. As a non-plastic composition a vulcanizedmixture comprising rubber, a Pararesin and a filler. r

8. The herein described process which com rises vulcanizin a mixture containing a ru ber material an cumaron resin.

'. ALFRED A. WELLS.

. 50' 6. As a new articleof manufacture, a vulf 

